Oval and Marquise Gemstone Faceting

http://www.myskeletonwatches.com/oval-and-marquise-gemstone-faceting/
Oval and Marquise Gemstone Faceting
Cutting oval and marquise shaped gems is only moderately tough if you have a preforming device and an accurate means of aligning it, and then the preform, with the lap. Gauging with a scale from the lap to a point on the preformer while it is in one index setting, then rotating it 180o and then gauging again, the adjusting and trying repeatedly until the two measurements are equal, seldom gives a sufficiently accurate result. You need to have a accurate and stable tool to make your measurements with and you can make one in a few minutes to develop sensational gemstones that can be used in making handmade jewelry.